unit-1 8051 MCU

The internal RAM memory of the 8051 is:

• 32 bytes

• 64 bytes

• 128 bytes

• 256 bytes

The 8051 has ________ 16-bit counter/timers.

• 1

• 2

• 3

• 4

MOV A, @ R1 will:

• copy R1 to the accumulator

• copy the accumulator to R1

• copy the contents of memory whose address is in R1 to the accumulator

• copy the accumulator to the contents of memory whose address is in R1

An alternate function of port pin P3.4 in the 8051 is:

• Timer 0

• Timer 1

• interrupt 0

• interrupt 1

8051 has four ___ ports which are of 8-bit each

• Input-Output

• Input

• output

• None of these

The 8051 can handle ________ interrupt sources.

The total external data memory that can be interfaced to the 8051 is:

• 32K

• 64K

• 128K

• 256K

Which of the following instructions will load the value 35H into the high byte of timer 0?

• MOV TH0, #35H

• MOV TH0, 35H

• MOV T0, #35H

• MOV T0, 35H

Bit-addressable memory locations are:

• 10H through 1FH

• 20H through 2FH

• 30H through 3FH

• 40H through 4FH

Which of the following statements will add the accumulator and register 3?

• ADD @R3, @A

• ADD @A, R3

• ADD R3, A

• ADD A, R3